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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) variable_interest_entity | Jun. 30, 2018 USD ($) securitization | Jun. 30, 2018 USD ($) securitization | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) securitization
Variable Interest Entity [Line Items] |  |  |  |  |
Real estate under development |  | $ 20.3 | $ 20.3 | $ 22.4 |
Riverchase Landing and The Clusters |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Consideration transferred | $ 12.5 |  |  |  |
Riverchase Landing and The Clusters |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of variable interest entities consolidated | variable_interest_entity | 2 |  |  |  |
VIE, Primary Beneficiary | RBDHC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Noncontrolling interest, ownership by parent, percentage |  |  | 50.00% |  |
Impairment of real estatement under development |  | $ 2.1 |  |  |
VIE, Primary Beneficiary | K-Series |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of consolidated securitizations | securitization |  | 7 | 7 |  | 7
Non-Financings, Multi-Family CMBS | K-Series |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Number of securitizations, non-financing VIE's | securitization |  | 6 | 6 |  | 6
Other Income | VIE, Primary Beneficiary | RBDHC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Impairment of real estatement under development |  | $ 2.1 |  |  |
Net Loss Attributable to Parent | VIE, Primary Beneficiary | RBDHC |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Impairment of real estatement under development |  | 1.1 |  |  |
Receivables and other assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Real estate under development |  | $ 20.3 | $ 20.3 |  | $ 22.9

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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